Self-propelling lifting-jack.



J. H. SENEPF & s. DIXON.

SELF PROPELLI NG LIFTING JACK.

APPLICATION FILED OUT. 19, 1910.

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hr. i o N. 0 N2: A U 7 Q O O J. H. SENEPF & S. DIXON.

SELF PROPELLING LIFTING JACK.

APPLICATION FILED OUT. 19, 1910.

992,914, Patented May 23, 1911.

3 SHEETS-SHEET 2.

J. H. SENEFF & S. DIXON.

SELF PROPELLING LIFTING JACK,

APPLICATION FILED 00119, 1910.

992,914, Patented May 23, 1911.

3 BHEETBBHEET 3.

m 8 :\\\\\\an F1 awe/M055 WWW V V Dixon e7 UNITEDSTATES Joann. snivnrr AND SHERMAN Dixon, manner-i LICK, zrnnmna;

SELF-PROPELLING' LIFTING-FJACK.

To a'lZ-whom'it may concern: i

Be it known that we, JOHN H. SENm-"r and SHERMAN DIXON, citizens of the United Statesfresiding at French Lick, in the county of Orange, State of Indiana, have invented .certain new. and useful Improvements in Self-Propelling. Lifting-Jacks; and We do .hereby declare the following to be a full, clear; and exactdescription of the invention,

1 tdwhich it appertains to make and use the such'as will enable others skilled in the art same.

i I .This invention relates to improvenients in lifting jacksandthe leading object in view is to provide a device of this character with a liftin screw and means adapted to operate the lifting scre'w'and to propel the device.

' Another object of the invention is the construction of a lifting mechanism having a fitting screw operatively arranged thereon, wheels for supportingthe mechanismand I operating means adapted to operate the.lift-= ing screw or 'rotatethe supporting wheels,

1 whereby the mechanism may be propelled is a bottom plan View of the device. Fig. 4

is a transverse sectional view taken on the line H of Fig. 1, looking in the direction of the arrow. Fig. 5 is a transverse sectionalview taken on the line 5-5 of Fig. 2.

Fig. 6 is a detail perspective view of the boxing forming a guide for the operating screvi 'Fig. 7 is a detail perspective view of a guide which fits within said box.

Referring to the accompanying drawings 5 and 6 denote the sides of the truck of the mechanism and 7 and 8 the ends thereof,

said ends7 and 8 having their outer edges turnedx'at right angles and secured against the ends of the sides 5 and 6. On the sides 5 and'6 and the ends 7 and 8 a top plate 9 is secured. On the forward end of the ruck .Mframe trunnions' 10 are located which receive thef apertured terminals of the draft I Specification of Lett ers Patent Patented May as, 19522 Application filed October 19, 1910. Serial No. 587.899

yoke 11 whereby said truck may be moved over a floor'or ot-hersuppoit. The sides 5 and 6 of the'truckare pro vided with brackets 12 'and have their'upper ends secured against the top plate 1:9aand their lower ends bent over the edges of the sides 5 and 6 and. extendedoutwardly: in a' horizontal plane. I The portions of" the brackets 12 engaging with the sides 5 and.

6 'are suitably riveted thereto and the hori zontal portions 13 of said brackets projecting under and outwardly of the lower edges of the sides 5. and 6 have'secured thereto bearings'l l on which the forward and rearward axles 15'and 16 are respectively mount .ed. The axles 15 and 16 .carry truck wheels 17 which are located. thereon between the sides 5 and 6; The axles 15 and '16 are provided with small gears or pinions 18 intermediate of their ends and these gears or pinions are adapted to mesh with the threads of the worm shaft 20- which is disposed longitudinally in the truck and has its outer ends extended through the ends 7 and .8 of said truck. The ends 7 and 8 are formed with shaft project and said projecting ends of the worm shaft are secured in place againstsaid boxesv by means oflock nuts 25 which bear against washer plates 26, which plates extend across the openings 24in the boxes 23. The guide blocks 22 are formed with 280 slots 21 adapted to permitsaid worm shaft slots 27 to receive the ends 28 of the adjusting, screws 29 which extend through-the upper portions of the boxes 23'and.are-su1t-- ably threaded thereon. The .lower ends 28 of the screws 29 are enlarged and are swiveled to the upper ends of the guide blocks 22, and said guide blocks are formed with openings 30 through which the outer endsol the worm shaft 20 project. By suitably manipulating the adjusting screws 29 the worm shaft 20 may be moved against the pinions or gears 18 on the axles 15 and 16 or away from said piiiions or gears.

The top plate 9 of the truck is formed with a centrally located bearing 31 through I of the pinion gear 25 has abearing on a which a lifting screw 32 operates, the same belng provided with a head-plece 33. The lower or inner end of the screw 32 carries "a gear 34 which meshes with a pinion'gear 35having their lower end slightly rounded so as to mesh with the threads of the worm shaft 20 when said Worm shaft is brought into engagement therewith. The. lower end bracket arm 36 which is fixed to the side member 5 on the truck.

The worm shaft 20 is provided on one end thereof with a ratchet 37 which carries a lever 38'which' is bifurcated to receive the ratchet 37 and is placed astride of said ratchet on the worm shaft.

5 one arm of the, pawl 39 will be held in The lever 38' carries a doubled armed pawl 39' which is adapted to engage with the ratchet 37, and

engagement with the ratchet 37 and the other arm will be held out of engagement therewith and'when it is desired to reverse the arrangement of the pawl with relation to the ratchet 37 the pawl may be tilted so that the pin 42 bears against the other shoulder of the projection 41. When the pawl is placed in an intermediate position so that the .pin 42 bears centrally on the projection 41 a both arms of the pawl will be held out of engagement with the ratchet 37. By this construction the lever 38 may be ca used to rotate the worm shaft 20 in either direction. What is claimed is z' -In a lifting mechanism, a wheeled truck, a lifting screw threaded in the truck, a shifting worm shaft journaled on the truck, means for transmittin worm shaft to the lifting screw, axles for supportingthe truck, gears mounted on the axles for engagement with the worm shaft and means for rotatingthe worm shaft.

In testimony whereof, we afiix our signatures 1n presence of two wltnesses.

JOHN H. SENEFF. SHERMAN DIXON.

RVitnesses:

Enos FISHER, JAMES T. CLAX'DON.

motion from the a 

